Yes, you may be sure about. Only the Brazilian production had this trapezoidal wheel arch at the rear fender, as far as I know. And since the very beginning, in 1960. Jeep bodies from 54 to 59 had the usual round arch. Also the pickup and the wagon suited that style.

From those years to the seventies the Jeep used the Willys 6 cilynder engine with F-head valves. In 1967-68 Willys was purchased by Ford and became here Ford-Willys and in the seventies, with the Maverick production came the 2.3 liter 4 OHC. Since then (1976), all Jeep were driven by this engine and 4-gears box. http://www.angelfire.com/wi/willysbr/jeep.html